diff --git a/Database/Persist/Postgresql.hs b/Database/Persist/Postgresql.hs
--- a/Database/Persist/Postgresql.hs
+++ b/Database/Persist/Postgresql.hs
@@ -339,16 +339,25 @@
         k (PGFF.typoid -> i) = PG.oid2int i
         listOf f = convertPV (PersistList . map f . PG.fromPGArray)
 
+builtinExtensionGetters :: Map.Map ByteString (Getter PersistValue)
+builtinExtensionGetters = Map.fromList
+    [ ("geometry",      convertPV (PersistDbSpecific . unUnknown))
+    , ("geography",     convertPV (PersistDbSpecific . unUnknown))
+    ]
+
+
 getGetter :: PG.Connection -> PG.Oid -> IO (Getter PersistValue)
 getGetter conn oid = case I.lookup (PG.oid2int oid) builtinGetters of
     Just getter -> return getter
     Nothing -> do
         tyinfo <- PG.getTypeInfo conn oid
-        error $ "Postgresql.getGetter: type "
-             ++ explain tyinfo
-             ++ " ("
-             ++ show oid
-             ++ ") not supported."
+        case Map.lookup (PG.typname tyinfo) builtinExtensionGetters of
+          Just getter -> return getter
+          Nothing -> error $ "Postgresql.getGetter: type "
+                          ++ explain tyinfo
+                          ++ " ("
+                          ++ show oid
+                          ++ ") not supported."
     where
         explain tyinfo = case B8.unpack $ PG.typname tyinfo of
                         t@('_':ty) -> t ++ " (array of " ++ ty ++ ")"
diff --git a/persistent-postgresql.cabal b/persistent-postgresql.cabal
--- a/persistent-postgresql.cabal
+++ b/persistent-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-postgresql
-version:         2.1
+version:         2.1.0.1
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa, Michael Snoyman <michael@snoyman.com>